# SPDX-FileCopyrightText: Copyright (c) 2023-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.  # noqa
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import logging
import threading
from contextlib import contextmanager

from cuopt_server.utils.logutil import message

health_status = "RUNNING"

sema = None


def health_init():
    global sema
    sema = threading.Semaphore(1)


@contextmanager
def sema_acquire():
    res = sema.acquire()
    try:
        yield res
    finally:
        if res:
            sema.release()


def _is_server_broken():
    return health_status != "RUNNING"


def set_unhealthy(msg):
    global health_status
    with sema_acquire():
        logging.error(message("ERROR : '%s' " % msg))
        health_status = "BROKEN"


def health():
    """
    Checks health of the server, and return status and message.
    """
    with sema_acquire():
        status = 1 if _is_server_broken() else 0
        msg = "Server is " + health_status
        return status, msg
